I'm sorry, and all due respect, people have always lost jobs for publicly expressing unpopular opinions, or those whose families are loud enough about their opinions which aren't popular. Antisocial Media just provides a much broader target audience and that much more likelihood of employers hearing such things.

Ultimately it comes down to being careful and thoughtful of your speech, and THAT should be common sense. I'm allowed to not believe in the Home Depot values, of course... But if they sign my paycheck it'd be a bad idea to carry around a sign saying so.